import { ToyReact, Component } from './ToyReact';

class Square extends Component {
  render() {
    return (
      <button className="square" onClick={ this.props.onClick }>
        { this.props.value }
      </button>
    );
  }
}

class Board extends Component {
  renderSquare(i) {
    return (
      <Square
        value={ this.props.squares[i] }
        onClick={ () => this.props.onClick(i) }
      />
    );
  }

  render() {
    return (
      <div>
        <div className="board-row">
          { this.renderSquare(0) }
          { this.renderSquare(1) }
          { this.renderSquare(2) }
        </div>
        <div className="board-row">
          { this.renderSquare(3) }
          { this.renderSquare(4) }
          { this.renderSquare(5) }
        </div>
        <div className="board-row">
          { this.renderSquare(6) }
          { this.renderSquare(7) }
          { this.renderSquare(8) }
        </div>
      </div>
    );
  }
}

class Game extends Component {
  constructor(props) {
    super(props);
    this.state = {
      history: [
        {
          squares: Array(9).fill(null)
        }
      ],
      stepNumber: 0,
      xIsNext: true
    };
  }

  handleClick(i) {
    const history = this.state.history.slice(0, this.state.stepNumber + 1);
    const current = history[history.length - 1];
    const squares = current.squares.slice();
    if (calculateWinner(squares) || squares[i]) {
      return;
    }
    squares[i] = this.state.xIsNext ? "X" : "O";
    this.setState({
      history: history.concat([
        {
          squares: squares
        }
      ]),
      stepNumber: history.length,
      xIsNext: !this.state.xIsNext
    });
  }

  jumpTo(step) {
    this.setState({
      stepNumber: step,
      xIsNext: (step % 2) === 0
    });
  }

  render() {
    const history = this.state.history;
    const current = history[this.state.stepNumber];
    const winner = calculateWinner(current.squares);

    const moves = history.map((step, move) => {
      const desc = move ?
        'Go to move #' + move :
        'Go to game start';
      return (
        <li key={ move }>
          <button onClick={ () => this.jumpTo(move) }>{ desc }</button>
        </li>
      );
    });

    let status;
    if (winner) {
      status = "Winner: " + winner;
    } else {
      status = "Next player: " + (this.state.xIsNext ? "X" : "O");
    }

    return (
      <div className="game">
        <div className="game-board">
          <Board
            squares={ current.squares }
            onClick={ i => this.handleClick(i) }
          />
        </div>

      </div>
    );
  }
}

// ========================================

setTimeout(() => {
  ToyReact.render(<Game/>, document.body);
  let game = <Game />
  console.log(game.vdom);
})

function calculateWinner(squares) {
  const lines = [
    [ 0, 1, 2 ],
    [ 3, 4, 5 ],
    [ 6, 7, 8 ],
    [ 0, 3, 6 ],
    [ 1, 4, 7 ],
    [ 2, 5, 8 ],
    [ 0, 4, 8 ],
    [ 2, 4, 6 ]
  ];
  for (let i = 0; i < lines.length; i++) {
    const [ a, b, c ] = lines[i];
    if (squares[a] && squares[a] === squares[b] && squares[a] === squares[c]) {
      return squares[a];
    }
  }
  return null;
}


